fs/jfs/super.c

   1 /*
   2  *   Copyright (C) International Business Machines Corp., 2000-2004
   3  *   Portions Copyright (C) Christoph Hellwig, 2001-2002
   4  *
   5  *   This program is free software;  you can redistribute it and/or modify
   6  *   it under the terms of the GNU General Public License as published by
   7  *   the Free Software Foundation; either version 2 of the License, or
   8  *   (at your option) any later version.
   9  *
  10  *   This program is distributed in the hope that it will be useful,
  11  *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  13  *   the GNU General Public License for more details.
  14  *
  15  *   You should have received a copy of the GNU General Public License
  16  *   along with this program;  if not, write to the Free Software
  17  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  18  */
  19
  20 #include <linux/fs.h>
  21 #include <linux/module.h>
  22 #include <linux/parser.h>
  23 #include <linux/completion.h>
  24 #include <linux/vfs.h>
  25 #include <linux/quotaops.h>
  26 #include <linux/mount.h>
  27 #include <linux/moduleparam.h>
  28 #include <linux/kthread.h>
  29 #include <linux/posix_acl.h>
  30 #include <linux/buffer_head.h>
  31 #include <linux/exportfs.h>
  32 #include <linux/crc32.h>
  33 #include <linux/slab.h>
  34 #include <asm/uaccess.h>
  35 #include <linux/seq_file.h>
  36
  37 #include "jfs_incore.h"
  38 #include "jfs_filsys.h"
  39 #include "jfs_inode.h"
  40 #include "jfs_metapage.h"
  41 #include "jfs_superblock.h"
  42 #include "jfs_dmap.h"
  43 #include "jfs_imap.h"
  44 #include "jfs_acl.h"
  45 #include "jfs_debug.h"
  46
  47 MODULE_DESCRIPTION("The Journaled Filesystem (JFS)");
  48 MODULE_AUTHOR("Steve Best/Dave Kleikamp/Barry Arndt, IBM");
  49 MODULE_LICENSE("GPL");
  50
  51 static struct kmem_cache * jfs_inode_cachep;
  52
  53 static const struct super_operations jfs_super_operations;
  54 static const struct export_operations jfs_export_operations;
  55 static struct file_system_type jfs_fs_type;
  56
  57 #define MAX_COMMIT_THREADS 64
  58 static int commit_threads = 0;
  59 module_param(commit_threads, int, 0);
  60 MODULE_PARM_DESC(commit_threads, "Number of commit threads");
  61
  62 static struct task_struct *jfsCommitThread[MAX_COMMIT_THREADS];
  63 struct task_struct *jfsIOthread;
  64 struct task_struct *jfsSyncThread;
  65
  66 #ifdef CONFIG_JFS_DEBUG
  67 int jfsloglevel = JFS_LOGLEVEL_WARN;
  68 module_param(jfsloglevel, int, 0644);
  69 MODULE_PARM_DESC(jfsloglevel, "Specify JFS loglevel (0, 1 or 2)");
  70 #endif
  71
  72 static void jfs_handle_error(struct super_block *sb)
  73 {
  74         struct jfs_sb_info *sbi = JFS_SBI(sb);
  75
  76         if (sb->s_flags & MS_RDONLY)
  77                 return;
  78
  79         updateSuper(sb, FM_DIRTY);
  80
  81         if (sbi->flag & JFS_ERR_PANIC)
  82                 panic("JFS (device %s): panic forced after error\n",
  83                         sb->s_id);
  84         else if (sbi->flag & JFS_ERR_REMOUNT_RO) {
  85                 jfs_err("ERROR: (device %s): remounting filesystem "
  86                         "as read-only\n",
  87                         sb->s_id);
  88                 sb->s_flags |= MS_RDONLY;
  89         }
  90
  91         /* nothing is done for continue beyond marking the superblock dirty */
  92 }
  93
  94 void jfs_error(struct super_block *sb, const char * function, ...)
  95 {
  96         static char error_buf[256];
  97         va_list args;
  98
  99         va_start(args, function);
 100         vsnprintf(error_buf, sizeof(error_buf), function, args);
 101         va_end(args);
 102
 103         printk(KERN_ERR "ERROR: (device %s): %s\n", sb->s_id, error_buf);
 104
 105         jfs_handle_error(sb);
 106 }
 107
 108 static struct inode *jfs_alloc_inode(struct super_block *sb)
 109 {
 110         struct jfs_inode_info *jfs_inode;
 111
 112         jfs_inode = kmem_cache_alloc(jfs_inode_cachep, GFP_NOFS);
 113         if (!jfs_inode)
 114                 return NULL;
 115         return &jfs_inode->vfs_inode;
 116 }
 117
 118 static void jfs_i_callback(struct rcu_head *head)
 119 {
 120         struct inode *inode = container_of(head, struct inode, i_rcu);
 121         struct jfs_inode_info *ji = JFS_IP(inode);
 122         kmem_cache_free(jfs_inode_cachep, ji);
 123 }
 124
 125 static void jfs_destroy_inode(struct inode *inode)
 126 {
 127         struct jfs_inode_info *ji = JFS_IP(inode);
 128
 129         BUG_ON(!list_empty(&ji->anon_inode_list));
 130
 131         spin_lock_irq(&ji->ag_lock);
 132         if (ji->active_ag != -1) {
 133                 struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap;
 134                 atomic_dec(&bmap->db_active[ji->active_ag]);
 135                 ji->active_ag = -1;
 136         }
 137         spin_unlock_irq(&ji->ag_lock);
 138         call_rcu(&inode->i_rcu, jfs_i_callback);
 139 }
 140
 141 static int jfs_statfs(struct dentry *dentry, struct kstatfs *buf)
 142 {
 143         struct jfs_sb_info *sbi = JFS_SBI(dentry->d_sb);
 144         s64 maxinodes;
 145         struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap;
 146
 147         jfs_info("In jfs_statfs");
 148         buf->f_type = JFS_SUPER_MAGIC;
 149         buf->f_bsize = sbi->bsize;
 150         buf->f_blocks = sbi->bmap->db_mapsize;
 151         buf->f_bfree = sbi->bmap->db_nfree;
 152         buf->f_bavail = sbi->bmap->db_nfree;
 153         /*
 154          * If we really return the number of allocated & free inodes, some
 155          * applications will fail because they won't see enough free inodes.
 156          * We'll try to calculate some guess as to how may inodes we can
 157          * really allocate
 158          *
 159          * buf->f_files = atomic_read(&imap->im_numinos);
 160          * buf->f_ffree = atomic_read(&imap->im_numfree);
 161          */
 162         maxinodes = min((s64) atomic_read(&imap->im_numinos) +
 163                         ((sbi->bmap->db_nfree >> imap->im_l2nbperiext)
 164                          << L2INOSPEREXT), (s64) 0xffffffffLL);
 165         buf->f_files = maxinodes;
 166         buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) -
 167                                     atomic_read(&imap->im_numfree));
 168         buf->f_fsid.val[0] = (u32)crc32_le(0, sbi->uuid, sizeof(sbi->uuid)/2);
 169         buf->f_fsid.val[1] = (u32)crc32_le(0, sbi->uuid + sizeof(sbi->uuid)/2,
 170                                         sizeof(sbi->uuid)/2);
 171
 172         buf->f_namelen = JFS_NAME_MAX;
 173         return 0;
 174 }
 175
 176 static void jfs_put_super(struct super_block *sb)
 177 {
 178         struct jfs_sb_info *sbi = JFS_SBI(sb);
 179         int rc;
 180
 181         jfs_info("In jfs_put_super");
 182
 183         dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
 184
 185         rc = jfs_umount(sb);
 186         if (rc)
 187                 jfs_err("jfs_umount failed with return code %d", rc);
 188
 189         unload_nls(sbi->nls_tab);
 190
 191         truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
 192         iput(sbi->direct_inode);
 193
 194         kfree(sbi);
 195 }
 196
 197 enum {
 198         Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize,
 199         Opt_resize_nosize, Opt_errors, Opt_ignore, Opt_err, Opt_quota,
 200         Opt_usrquota, Opt_grpquota, Opt_uid, Opt_gid, Opt_umask
 201 };
 202
 203 static const match_table_t tokens = {
 204         {Opt_integrity, "integrity"},
 205         {Opt_nointegrity, "nointegrity"},
 206         {Opt_iocharset, "iocharset=%s"},
 207         {Opt_resize, "resize=%u"},
 208         {Opt_resize_nosize, "resize"},
 209         {Opt_errors, "errors=%s"},
 210         {Opt_ignore, "noquota"},
 211         {Opt_ignore, "quota"},
 212         {Opt_usrquota, "usrquota"},
 213         {Opt_grpquota, "grpquota"},
 214         {Opt_uid, "uid=%u"},
 215         {Opt_gid, "gid=%u"},
 216         {Opt_umask, "umask=%u"},
 217         {Opt_err, NULL}
 218 };
 219
 220 static int parse_options(char *options, struct super_block *sb, s64 *newLVSize,
 221                          int *flag)
 222 {
 223         void *nls_map = (void *)-1;     /* -1: no change;  NULL: none */
 224         char *p;
 225         struct jfs_sb_info *sbi = JFS_SBI(sb);
 226
 227         *newLVSize = 0;
 228
 229         if (!options)
 230                 return 1;
 231
 232         while ((p = strsep(&options, ",")) != NULL) {
 233                 substring_t args[MAX_OPT_ARGS];
 234                 int token;
 235                 if (!*p)
 236                         continue;
 237
 238                 token = match_token(p, tokens, args);
 239                 switch (token) {
 240                 case Opt_integrity:
 241                         *flag &= ~JFS_NOINTEGRITY;
 242                         break;
 243                 case Opt_nointegrity:
 244                         *flag |= JFS_NOINTEGRITY;
 245                         break;
 246                 case Opt_ignore:
 247                         /* Silently ignore the quota options */
 248                         /* Don't do anything ;-) */
 249                         break;
 250                 case Opt_iocharset:
 251                         if (nls_map && nls_map != (void *) -1)
 252                                 unload_nls(nls_map);
 253                         if (!strcmp(args[0].from, "none"))
 254                                 nls_map = NULL;
 255                         else {
 256                                 nls_map = load_nls(args[0].from);
 257                                 if (!nls_map) {
 258                                         printk(KERN_ERR
 259                                                "JFS: charset not found\n");
 260                                         goto cleanup;
 261                                 }
 262                         }
 263                         break;
 264                 case Opt_resize:
 265                 {
 266                         char *resize = args[0].from;
 267                         *newLVSize = simple_strtoull(resize, &resize, 0);
 268                         break;
 269                 }
 270                 case Opt_resize_nosize:
 271                 {
 272                         *newLVSize = sb->s_bdev->bd_inode->i_size >>
 273                                 sb->s_blocksize_bits;
 274                         if (*newLVSize == 0)
 275                                 printk(KERN_ERR
 276                                        "JFS: Cannot determine volume size\n");
 277                         break;
 278                 }
 279                 case Opt_errors:
 280                 {
 281                         char *errors = args[0].from;
 282                         if (!errors || !*errors)
 283                                 goto cleanup;
 284                         if (!strcmp(errors, "continue")) {
 285                                 *flag &= ~JFS_ERR_REMOUNT_RO;
 286                                 *flag &= ~JFS_ERR_PANIC;
 287                                 *flag |= JFS_ERR_CONTINUE;
 288                         } else if (!strcmp(errors, "remount-ro")) {
 289                                 *flag &= ~JFS_ERR_CONTINUE;
 290                                 *flag &= ~JFS_ERR_PANIC;
 291                                 *flag |= JFS_ERR_REMOUNT_RO;
 292                         } else if (!strcmp(errors, "panic")) {
 293                                 *flag &= ~JFS_ERR_CONTINUE;
 294                                 *flag &= ~JFS_ERR_REMOUNT_RO;
 295                                 *flag |= JFS_ERR_PANIC;
 296                         } else {
 297                                 printk(KERN_ERR
 298                                        "JFS: %s is an invalid error handler\n",
 299                                        errors);
 300                                 goto cleanup;
 301                         }
 302                         break;
 303                 }
 304
 305 #ifdef CONFIG_QUOTA
 306                 case Opt_quota:
 307                 case Opt_usrquota:
 308                         *flag |= JFS_USRQUOTA;
 309                         break;
 310                 case Opt_grpquota:
 311                         *flag |= JFS_GRPQUOTA;
 312                         break;
 313 #else
 314                 case Opt_usrquota:
 315                 case Opt_grpquota:
 316                 case Opt_quota:
 317                         printk(KERN_ERR
 318                                "JFS: quota operations not supported\n");
 319                         break;
 320 #endif
 321                 case Opt_uid:
 322                 {
 323                         char *uid = args[0].from;
 324                         sbi->uid = simple_strtoul(uid, &uid, 0);
 325                         break;
 326                 }
 327                 case Opt_gid:
 328                 {
 329                         char *gid = args[0].from;
 330                         sbi->gid = simple_strtoul(gid, &gid, 0);
 331                         break;
 332                 }
 333                 case Opt_umask:
 334                 {
 335                         char *umask = args[0].from;
 336                         sbi->umask = simple_strtoul(umask, &umask, 8);
 337                         if (sbi->umask & ~0777) {
 338                                 printk(KERN_ERR
 339                                        "JFS: Invalid value of umask\n");
 340                                 goto cleanup;
 341                         }
 342                         break;
 343                 }
 344                 default:
 345                         printk("jfs: Unrecognized mount option \"%s\" "
 346                                         " or missing value\n", p);
 347                         goto cleanup;
 348                 }
 349         }
 350
 351         if (nls_map != (void *) -1) {
 352                 /* Discard old (if remount) */
 353                 unload_nls(sbi->nls_tab);
 354                 sbi->nls_tab = nls_map;
 355         }
 356         return 1;
 357
 358 cleanup:
 359         if (nls_map && nls_map != (void *) -1)
 360                 unload_nls(nls_map);
 361         return 0;
 362 }
 363
 364 static int jfs_remount(struct super_block *sb, int *flags, char *data)
 365 {
 366         s64 newLVSize = 0;
 367         int rc = 0;
 368         int flag = JFS_SBI(sb)->flag;
 369         int ret;
 370
 371         if (!parse_options(data, sb, &newLVSize, &flag)) {
 372                 return -EINVAL;
 373         }
 374
 375         if (newLVSize) {
 376                 if (sb->s_flags & MS_RDONLY) {
 377                         printk(KERN_ERR
 378                   "JFS: resize requires volume to be mounted read-write\n");
 379                         return -EROFS;
 380                 }
 381                 rc = jfs_extendfs(sb, newLVSize, 0);
 382                 if (rc)
 383                         return rc;
 384         }
 385
 386         if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) {
 387                 /*
 388                  * Invalidate any previously read metadata.  fsck may have
 389                  * changed the on-disk data since we mounted r/o
 390                  */
 391                 truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0);
 392
 393                 JFS_SBI(sb)->flag = flag;
 394                 ret = jfs_mount_rw(sb, 1);
 395
 396                 /* mark the fs r/w for quota activity */
 397                 sb->s_flags &= ~MS_RDONLY;
 398
 399                 dquot_resume(sb, -1);
 400                 return ret;
 401         }
 402         if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) {
 403                 rc = dquot_suspend(sb, -1);
 404                 if (rc < 0) {
 405                         return rc;
 406                 }
 407                 rc = jfs_umount_rw(sb);
 408                 JFS_SBI(sb)->flag = flag;
 409                 return rc;
 410         }
 411         if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY))
 412                 if (!(sb->s_flags & MS_RDONLY)) {
 413                         rc = jfs_umount_rw(sb);
 414                         if (rc)
 415                                 return rc;
 416
 417                         JFS_SBI(sb)->flag = flag;
 418                         ret = jfs_mount_rw(sb, 1);
 419                         return ret;
 420                 }
 421         JFS_SBI(sb)->flag = flag;
 422
 423         return 0;
 424 }
 425
 426 static int jfs_fill_super(struct super_block *sb, void *data, int silent)
 427 {
 428         struct jfs_sb_info *sbi;
 429         struct inode *inode;
 430         int rc;
 431         s64 newLVSize = 0;
 432         int flag, ret = -EINVAL;
 433
 434         jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);
 435
 436         if (!new_valid_dev(sb->s_bdev->bd_dev))
 437                 return -EOVERFLOW;
 438
 439         sbi = kzalloc(sizeof (struct jfs_sb_info), GFP_KERNEL);
 440         if (!sbi)
 441                 return -ENOMEM;
 442
 443         sb->s_fs_info = sbi;
 444         sb->s_max_links = JFS_LINK_MAX;
 445         sbi->sb = sb;
 446         sbi->uid = sbi->gid = sbi->umask = -1;
 447
 448         /* initialize the mount flag and determine the default error handler */
 449         flag = JFS_ERR_REMOUNT_RO;
 450
 451         if (!parse_options((char *) data, sb, &newLVSize, &flag))
 452                 goto out_kfree;
 453         sbi->flag = flag;
 454
 455 #ifdef CONFIG_JFS_POSIX_ACL
 456         sb->s_flags |= MS_POSIXACL;
 457 #endif
 458
 459         if (newLVSize) {
 460                 printk(KERN_ERR "resize option for remount only\n");
 461                 goto out_kfree;
 462         }
 463
 464         /*
 465          * Initialize blocksize to 4K.
 466          */
 467         sb_set_blocksize(sb, PSIZE);
 468
 469         /*
 470          * Set method vectors.
 471          */
 472         sb->s_op = &jfs_super_operations;
 473         sb->s_export_op = &jfs_export_operations;
 474 #ifdef CONFIG_QUOTA
 475         sb->dq_op = &dquot_operations;
 476         sb->s_qcop = &dquot_quotactl_ops;
 477 #endif
 478
 479         /*
 480          * Initialize direct-mapping inode/address-space
 481          */
 482         inode = new_inode(sb);
 483         if (inode == NULL) {
 484                 ret = -ENOMEM;
 485                 goto out_unload;
 486         }
 487         inode->i_ino = 0;
 488         inode->i_size = sb->s_bdev->bd_inode->i_size;
 489         inode->i_mapping->a_ops = &jfs_metapage_aops;
 490         insert_inode_hash(inode);
 491         mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
 492
 493         sbi->direct_inode = inode;
 494
 495         rc = jfs_mount(sb);
 496         if (rc) {
 497                 if (!silent) {
 498                         jfs_err("jfs_mount failed w/return code = %d", rc);
 499                 }
 500                 goto out_mount_failed;
 501         }
 502         if (sb->s_flags & MS_RDONLY)
 503                 sbi->log = NULL;
 504         else {
 505                 rc = jfs_mount_rw(sb, 0);
 506                 if (rc) {
 507                         if (!silent) {
 508                                 jfs_err("jfs_mount_rw failed, return code = %d",
 509                                         rc);
 510                         }
 511                         goto out_no_rw;
 512                 }
 513         }
 514
 515         sb->s_magic = JFS_SUPER_MAGIC;
 516
 517         if (sbi->mntflag & JFS_OS2)
 518                 sb->s_d_op = &jfs_ci_dentry_operations;
 519
 520         inode = jfs_iget(sb, ROOT_I);
 521         if (IS_ERR(inode)) {
 522                 ret = PTR_ERR(inode);
 523                 goto out_no_rw;
 524         }
 525         sb->s_root = d_make_root(inode);
 526         if (!sb->s_root)
 527                 goto out_no_root;
 528
 529         /* logical blocks are represented by 40 bits in pxd_t, etc. */
 530         sb->s_maxbytes = ((u64) sb->s_blocksize) << 40;
 531 #if BITS_PER_LONG == 32
 532         /*
 533          * Page cache is indexed by long.
 534          * I would use MAX_LFS_FILESIZE, but it's only half as big
 535          */
 536         sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, (u64)sb->s_maxbytes);
 537 #endif
 538         sb->s_time_gran = 1;
 539         return 0;
 540
 541 out_no_root:
 542         jfs_err("jfs_read_super: get root dentry failed");
 543
 544 out_no_rw:
 545         rc = jfs_umount(sb);
 546         if (rc) {
 547                 jfs_err("jfs_umount failed with return code %d", rc);
 548         }
 549 out_mount_failed:
 550         filemap_write_and_wait(sbi->direct_inode->i_mapping);
 551         truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
 552         make_bad_inode(sbi->direct_inode);
 553         iput(sbi->direct_inode);
 554         sbi->direct_inode = NULL;
 555 out_unload:
 556         if (sbi->nls_tab)
 557                 unload_nls(sbi->nls_tab);
 558 out_kfree:
 559         kfree(sbi);
 560         return ret;
 561 }
 562
 563 static int jfs_freeze(struct super_block *sb)
 564 {
 565         struct jfs_sb_info *sbi = JFS_SBI(sb);
 566         struct jfs_log *log = sbi->log;
 567
 568         if (!(sb->s_flags & MS_RDONLY)) {
 569                 txQuiesce(sb);
 570                 lmLogShutdown(log);
 571                 updateSuper(sb, FM_CLEAN);
 572         }
 573         return 0;
 574 }
 575
 576 static int jfs_unfreeze(struct super_block *sb)
 577 {
 578         struct jfs_sb_info *sbi = JFS_SBI(sb);
 579         struct jfs_log *log = sbi->log;
 580         int rc = 0;
 581
 582         if (!(sb->s_flags & MS_RDONLY)) {
 583                 updateSuper(sb, FM_MOUNT);
 584                 if ((rc = lmLogInit(log)))
 585                         jfs_err("jfs_unlock failed with return code %d", rc);
 586                 else
 587                         txResume(sb);
 588         }
 589         return 0;
 590 }
 591
 592 static struct dentry *jfs_do_mount(struct file_system_type *fs_type,
 593         int flags, const char *dev_name, void *data)
 594 {
 595         return mount_bdev(fs_type, flags, dev_name, data, jfs_fill_super);
 596 }
 597
 598 static int jfs_sync_fs(struct super_block *sb, int wait)
 599 {
 600         struct jfs_log *log = JFS_SBI(sb)->log;
 601
 602         /* log == NULL indicates read-only mount */
 603         if (log) {
 604                 jfs_flush_journal(log, wait);
 605                 jfs_syncpt(log, 0);
 606         }
 607
 608         return 0;
 609 }
 610
 611 static int jfs_show_options(struct seq_file *seq, struct dentry *root)
 612 {
 613         struct jfs_sb_info *sbi = JFS_SBI(root->d_sb);
 614
 615         if (sbi->uid != -1)
 616                 seq_printf(seq, ",uid=%d", sbi->uid);
 617         if (sbi->gid != -1)
 618                 seq_printf(seq, ",gid=%d", sbi->gid);
 619         if (sbi->umask != -1)
 620                 seq_printf(seq, ",umask=%03o", sbi->umask);
 621         if (sbi->flag & JFS_NOINTEGRITY)
 622                 seq_puts(seq, ",nointegrity");
 623         if (sbi->nls_tab)
 624                 seq_printf(seq, ",iocharset=%s", sbi->nls_tab->charset);
 625         if (sbi->flag & JFS_ERR_CONTINUE)
 626                 seq_printf(seq, ",errors=continue");
 627         if (sbi->flag & JFS_ERR_PANIC)
 628                 seq_printf(seq, ",errors=panic");
 629
 630 #ifdef CONFIG_QUOTA
 631         if (sbi->flag & JFS_USRQUOTA)
 632                 seq_puts(seq, ",usrquota");
 633
 634         if (sbi->flag & JFS_GRPQUOTA)
 635                 seq_puts(seq, ",grpquota");
 636 #endif
 637
 638         return 0;
 639 }
 640
 641 #ifdef CONFIG_QUOTA
 642
 643 /* Read data from quotafile - avoid pagecache and such because we cannot afford
 644  * acquiring the locks... As quota files are never truncated and quota code
 645  * itself serializes the operations (and no one else should touch the files)
 646  * we don't have to be afraid of races */
 647 static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data,
 648                               size_t len, loff_t off)
 649 {
 650         struct inode *inode = sb_dqopt(sb)->files[type];
 651         sector_t blk = off >> sb->s_blocksize_bits;
 652         int err = 0;
 653         int offset = off & (sb->s_blocksize - 1);
 654         int tocopy;
 655         size_t toread;
 656         struct buffer_head tmp_bh;
 657         struct buffer_head *bh;
 658         loff_t i_size = i_size_read(inode);
 659
 660         if (off > i_size)
 661                 return 0;
 662         if (off+len > i_size)
 663                 len = i_size-off;
 664         toread = len;
 665         while (toread > 0) {
 666                 tocopy = sb->s_blocksize - offset < toread ?
 667                                 sb->s_blocksize - offset : toread;
 668
 669                 tmp_bh.b_state = 0;
 670                 tmp_bh.b_size = 1 << inode->i_blkbits;
 671                 err = jfs_get_block(inode, blk, &tmp_bh, 0);
 672                 if (err)
 673                         return err;
 674                 if (!buffer_mapped(&tmp_bh))    /* A hole? */
 675                         memset(data, 0, tocopy);
 676                 else {
 677                         bh = sb_bread(sb, tmp_bh.b_blocknr);
 678                         if (!bh)
 679                                 return -EIO;
 680                         memcpy(data, bh->b_data+offset, tocopy);
 681                         brelse(bh);
 682                 }
 683                 offset = 0;
 684                 toread -= tocopy;
 685                 data += tocopy;
 686                 blk++;
 687         }
 688         return len;
 689 }
 690
 691 /* Write to quotafile */
 692 static ssize_t jfs_quota_write(struct super_block *sb, int type,
 693                                const char *data, size_t len, loff_t off)
 694 {
 695         struct inode *inode = sb_dqopt(sb)->files[type];
 696         sector_t blk = off >> sb->s_blocksize_bits;
 697         int err = 0;
 698         int offset = off & (sb->s_blocksize - 1);
 699         int tocopy;
 700         size_t towrite = len;
 701         struct buffer_head tmp_bh;
 702         struct buffer_head *bh;
 703
 704         mutex_lock(&inode->i_mutex);
 705         while (towrite > 0) {
 706                 tocopy = sb->s_blocksize - offset < towrite ?
 707                                 sb->s_blocksize - offset : towrite;
 708
 709                 tmp_bh.b_state = 0;
 710                 tmp_bh.b_size = 1 << inode->i_blkbits;
 711                 err = jfs_get_block(inode, blk, &tmp_bh, 1);
 712                 if (err)
 713                         goto out;
 714                 if (offset || tocopy != sb->s_blocksize)
 715                         bh = sb_bread(sb, tmp_bh.b_blocknr);
 716                 else
 717                         bh = sb_getblk(sb, tmp_bh.b_blocknr);
 718                 if (!bh) {
 719                         err = -EIO;
 720                         goto out;
 721                 }
 722                 lock_buffer(bh);
 723                 memcpy(bh->b_data+offset, data, tocopy);
 724                 flush_dcache_page(bh->b_page);
 725                 set_buffer_uptodate(bh);
 726                 mark_buffer_dirty(bh);
 727                 unlock_buffer(bh);
 728                 brelse(bh);
 729                 offset = 0;
 730                 towrite -= tocopy;
 731                 data += tocopy;
 732                 blk++;
 733         }
 734 out:
 735         if (len == towrite) {
 736                 mutex_unlock(&inode->i_mutex);
 737                 return err;
 738         }
 739         if (inode->i_size < off+len-towrite)
 740                 i_size_write(inode, off+len-towrite);
 741         inode->i_version++;
 742         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
 743         mark_inode_dirty(inode);
 744         mutex_unlock(&inode->i_mutex);
 745         return len - towrite;
 746 }
 747
 748 #endif
 749
 750 static const struct super_operations jfs_super_operations = {
 751         .alloc_inode    = jfs_alloc_inode,
 752         .destroy_inode  = jfs_destroy_inode,
 753         .dirty_inode    = jfs_dirty_inode,
 754         .write_inode    = jfs_write_inode,
 755         .evict_inode    = jfs_evict_inode,
 756         .put_super      = jfs_put_super,
 757         .sync_fs        = jfs_sync_fs,
 758         .freeze_fs      = jfs_freeze,
 759         .unfreeze_fs    = jfs_unfreeze,
 760         .statfs         = jfs_statfs,
 761         .remount_fs     = jfs_remount,
 762         .show_options   = jfs_show_options,
 763 #ifdef CONFIG_QUOTA
 764         .quota_read     = jfs_quota_read,
 765         .quota_write    = jfs_quota_write,
 766 #endif
 767 };
 768
 769 static const struct export_operations jfs_export_operations = {
 770         .fh_to_dentry   = jfs_fh_to_dentry,
 771         .fh_to_parent   = jfs_fh_to_parent,
 772         .get_parent     = jfs_get_parent,
 773 };
 774
 775 static struct file_system_type jfs_fs_type = {
 776         .owner          = THIS_MODULE,
 777         .name           = "jfs",
 778         .mount          = jfs_do_mount,
 779         .kill_sb        = kill_block_super,
 780         .fs_flags       = FS_REQUIRES_DEV,
 781 };
 782
 783 static void init_once(void *foo)
 784 {
 785         struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
 786
 787         memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
 788         INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
 789         init_rwsem(&jfs_ip->rdwrlock);
 790         mutex_init(&jfs_ip->commit_mutex);
 791         init_rwsem(&jfs_ip->xattr_sem);
 792         spin_lock_init(&jfs_ip->ag_lock);
 793         jfs_ip->active_ag = -1;
 794         inode_init_once(&jfs_ip->vfs_inode);
 795 }
 796
 797 static int __init init_jfs_fs(void)
 798 {
 799         int i;
 800         int rc;
 801
 802         jfs_inode_cachep =
 803             kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0,
 804                             SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
 805                             init_once);
 806         if (jfs_inode_cachep == NULL)
 807                 return -ENOMEM;
 808
 809         /*
 810          * Metapage initialization
 811          */
 812         rc = metapage_init();
 813         if (rc) {
 814                 jfs_err("metapage_init failed w/rc = %d", rc);
 815                 goto free_slab;
 816         }
 817
 818         /*
 819          * Transaction Manager initialization
 820          */
 821         rc = txInit();
 822         if (rc) {
 823                 jfs_err("txInit failed w/rc = %d", rc);
 824                 goto free_metapage;
 825         }
 826
 827         /*
 828          * I/O completion thread (endio)
 829          */
 830         jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO");
 831         if (IS_ERR(jfsIOthread)) {
 832                 rc = PTR_ERR(jfsIOthread);
 833                 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
 834                 goto end_txmngr;
 835         }
 836
 837         if (commit_threads < 1)
 838                 commit_threads = num_online_cpus();
 839         if (commit_threads > MAX_COMMIT_THREADS)
 840                 commit_threads = MAX_COMMIT_THREADS;
 841
 842         for (i = 0; i < commit_threads; i++) {
 843                 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL, "jfsCommit");
 844                 if (IS_ERR(jfsCommitThread[i])) {
 845                         rc = PTR_ERR(jfsCommitThread[i]);
 846                         jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
 847                         commit_threads = i;
 848                         goto kill_committask;
 849                 }
 850         }
 851
 852         jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync");
 853         if (IS_ERR(jfsSyncThread)) {
 854                 rc = PTR_ERR(jfsSyncThread);
 855                 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
 856                 goto kill_committask;
 857         }
 858
 859 #ifdef PROC_FS_JFS
 860         jfs_proc_init();
 861 #endif
 862
 863         rc = register_filesystem(&jfs_fs_type);
 864         if (!rc)
 865                 return 0;
 866
 867 #ifdef PROC_FS_JFS
 868         jfs_proc_clean();
 869 #endif
 870         kthread_stop(jfsSyncThread);
 871 kill_committask:
 872         for (i = 0; i < commit_threads; i++)
 873                 kthread_stop(jfsCommitThread[i]);
 874         kthread_stop(jfsIOthread);
 875 end_txmngr:
 876         txExit();
 877 free_metapage:
 878         metapage_exit();
 879 free_slab:
 880         kmem_cache_destroy(jfs_inode_cachep);
 881         return rc;
 882 }
 883
 884 static void __exit exit_jfs_fs(void)
 885 {
 886         int i;
 887
 888         jfs_info("exit_jfs_fs called");
 889
 890         txExit();
 891         metapage_exit();
 892
 893         kthread_stop(jfsIOthread);
 894         for (i = 0; i < commit_threads; i++)
 895                 kthread_stop(jfsCommitThread[i]);
 896         kthread_stop(jfsSyncThread);
 897 #ifdef PROC_FS_JFS
 898         jfs_proc_clean();
 899 #endif
 900         unregister_filesystem(&jfs_fs_type);
 901         kmem_cache_destroy(jfs_inode_cachep);
 902 }
 903
 904 module_init(init_jfs_fs)
 905 module_exit(exit_jfs_fs)